Juggernaut (A gigantic, inhumanoid Demon sending demonic energy balls to the enemy walls. From a hit wall segment, the energy will slowly spread each turn. On a square with demonic energy, all non-demonic units will have a stat decrease)
OR
Juggernaut (A gigantic, inhumanoid Demon sending demonic energy balls to the enemy walls. From a hit wall segment, the energy will slowly spread each turn. On a square with demonic energy, all enemy units will suffer damage each turn)
OR
Hellraiser (A gigantic, roughly humanoid Demon which sets Hell free at the target wall segment. THere will also appear some Abyss Core Units behind the wall segment)
OR
Dark Hole Creator (Name to be changed. This hald-machine-half-demon creature creates a mysterious hole at the target wall, that sucks matter in. Also all units within a range of 4 Hexes will be drawn to it (1 Hex for large, 2 for small units. If this way a unit reaches the Hole, it also suffers damage.))
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ICTC announced

Library Tent (Inside the healing Tent, the Archivist also carries his precious spell books. Thus Casting units of you gain a spell from the hero's spell book each battle: Core Units gain a lvl. 1-2 spell, Elite Units gain a lvl. 2-3 spell, Champion Units gain a lvl. 3-4 spell; Upgraded units gain one spell more.)
OR
Mage Tent (Instead of normal healers, mages are inside this tent. It can either heal friendly units, or cast a spell from a small spell book (spells levl&kinds probably determined by War MAchines Skill&Magic Skills of the hero))
OR
A better idea by you
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ICTC announced

Magic Ballista (works like the mage attack from H5, damaging ALL units the bolt passes on it's way)
OR
Elemental Ballista (Deals additional damage of a random element at attack)
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Bolter (An arcane war machine setting bolts of lightning onto the enemy units, dealing heavy lightning damage instead of physical one)
OR
PRecisioned Ballista (THis ballista finds its targets in a magical way. It has the "No ranged Penalty" ability and also gets no penalty for shooting over obstacles, walls, large units, etc.)
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ICTC announced